Ruby Regular Expression Case Insensitive

M makes the dot match newlines.

Ruby regular expression case insensitive.

Think about an email address with a ruby regex you can define what a valid email address looks like. You can also use regular expressions as your when condition. A specific sequence of. A ruby regular expression editor.

I case insensitive m make dot match newlines x ignore whitespace in regex o perform substitutions. The tables below are a reference to basic regex. In the following example we have a serial code with an initial letter that tells us how risky this product is to consume. Wrap words show invisibles.

It you want a bookmark here s a direct link to the regex reference tables i encourage you to print the tables so you have a cheat sheet on your desk for quick reference. Case serial code when ac low risk when al medium risk when ax high risk else unknown risk end when not to use ruby case. O causes any substitutions in a particular regex literal. Rubular is a ruby based regular expression editor.

Regular expressions regex or regexp are extremely useful in extracting information from any text by searching for one or more matches of a specific search pattern i e. X tells ruby to ignore whitespace between regex tokens. Regular expression patterns are often used with modifiers also called flags that redefine regex behavior regex modifiers can be regular e g. Ruby case regex.

Abc i and inline or embedded e g. Your test string. Ruby supports the following modifiers. I makes the regex match case insensitive.

While reading the rest of the site when in doubt you can always come back and look here. It s a handy way to test regular expressions as you write them. Constructs a new regular expression from pattern which can be either a string or a regexp in which case that regexp s options are propagated and new options may not be specified a change as of ruby 1 8. Ruby indeed uses m whereas perl and many other programming languages use s for dot matches newlines.

47 minutes to read 11. In other words your program will be able to tell.